For RSA algorithm, no license required for any products developed after September 6, 2000. The date is important.

BEDFORD, MA.— RSA® Security Inc. (NASDAQ: RSAS) today announced it has
released the RSA public key encryption algorithm into the public
domain, allowing anyone to create products that incorporate their own
implementation of the algorithm. This means that RSA Security has
waived its rights to enforce the patent for any development activities
that include the RSA algorithm occurring after September 6, 2000.